Krebs on Security

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Posts Tagged: transparency report

If your strategy for remaining safe and secure online is mainly to avoid visiting dodgy Web sites, it’s time to consider a new approach. Data released today by Google serves as a welcome reminder that drive-by malware attacks are far more likely to come from hacked, legitimate Web sites than from sites set up by attackers to intentionally host and distribute malicious software.

Today, Google released a truckload of data from its Safe Browsing program, which flags and warns users about more than 10,000 suspicious and malicious Web sites each day. The information clearly shows that gone are the days when folks could avoid giving their computers a nasty little rash simply by staying out of the Internet’s red-light districts (networks with large aggregations of porn and piracy sites, for example).

At the same time, some places on the Internet clearly are far more dangerous than others, Google’s data sets show. Have a look at the following graphic, which lists the most hostile Internet providers in the United States (the U.S. is currently responsible for just 2 percent of the world’s malicious sites, Google says).

Concentrations of hacked and malicious sites at U.S. Internet providers.Source: Google

The most malicious U.S. network listed by Google — a data center run by a company in New York called Pilosoft — is no stranger to lists charting the top sources of badness online. Pilosoft figured prominently in Operation Ghost Click, a U.S. Justice Department takedown targeting the DNS Changer botnet, which had a significant portion of its operations based at Pilosoft. Google says it has scanned 13 percent of Pilosoft’s network, and found that more than half of the sites it scanned were malicious.

Some networks are completely overrun with malicious sites, and some actively seek out this condition.

Of course, more mainstream networks and ISPs also are constantly battling malicious sites within their borders. It’s worth noting that 22 percent of the sites hosted at one section of the network run by major ISP Comcast (AS20214) are malicious, according to Google, although the company says it has scanned only 4 percent of this portion Comcast’s network so far. Google’s data is broken down by “autonomous system” (AS) numbers — which are basically a numerical way of keeping track of networks — and a large ISP may control numerous ASes.

Several other Comcast ASes are listed in the first few pages of Google’s index of U.S.-based badness. To be fair, Comcast is the nation’s largest cable Internet provider, so it’s perhaps unsurprising that it hosts so many compromised sites. However, Comcast’s largest competitor in the United States — Verizon — doesn’t appear until page 19 of Google’s results (with 5 percent of scanned sites malicious and 5 percent of the network scanned).